Synopsis: If root ever does "rm -rf /tmp/foo" for a directory structure not completely owned by root, a local user can delete all files that root can. Such deletions are common for (a) /tmp cleanup and (b) before creating a specific directory in /tmp/. Details: "rm -r" implementations (Solaris 7, Gnu 4.0 checked) walk the directories, lstats files, and chdirs into directories (and recurs). Oh, and deletes stuff, of course. It is possible to replace a directory by a symlink, say "/", and have rm cheerfully follow it. The race window is small -- it will take thousands upon thousands of tries. Moreover, since the racing involves rmdir -- which typically is not very fast -- you'll need patience and "nice" and any other help you can get. Solutions: Maybe stat "." after chdir to verify that we ended up the expected place? Also affected: chmod, chown, chgrp. (Probably; this is guesswork.) 
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